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15 October, 21:45

A chemist reacts 8.85 g of iron with an excess of hydrochloric acid to form hydrogen gas and iron (II) chloride. Calculate the theoretical yield and the percent yield of hydrogen if 0.27 g of H2 are collected.

TY = g H2 PY = %

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  1. 16 October, 00:23
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    The theoretical yield and percent yield of hydrogen if 0.27 g of H2 collected is calculated as follows

    write the reaction equation

    that is Fe + Hcl = H2 + FeCl2

    calculate moles of Fe = mass/molar mass = 8.85 g/56 g/mol = 0.158 moles

    by use mole ratio between Fe : H2 which is 1:1 the theoretical moles of hydrogen = 0.158moles

    the theoretical mass is therefore = moles x molar mass

    = 0.158 mol x2g/mol = 0.316 grams

    % mass = actual mass / theoretical mass x 100

    = 0.27/0.316 x100 = 85.4 %
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